Heat your oven to 350 degrees.

In a large bowl, whisk together the eggs and sugar. Slowly whisk in the melted butter.

My cocoa was clumpy, so I sifted it into the egg, sugar, and butter mixture so that the batter would be smoother. Then add in the flour, salt, and vanilla. Whisk to combine.

Gather 5 oven safe bowls that can each hold 1 cup. Place them on a baking sheet. Add one marshmallow to the bottom of each bowl. Pour the batter over the marshmallows. Sprinkle the top with the chocolate chips.

Place the cakes in the oven to bake for 20 minutes - until the center is almost set.

Remove the cakes from the oven. Dust with the powdered sugar - this just makes them look prettier. Add a marshmallow on top.

Increase the heat of oven to broil, and return the cakes to the oven. Keep an eye on them and let the marshmallows melt and get toasted.

Remove from the oven and serve right away.